Form for concrete wall construction



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J. JOHNSON FQRM FOR CONCRETE WALL CONSTRUCTION1 Fiied sept. 13, 192.2

Patented .lune 12, 1923.

All

JAMES JOHNSON, OI SOUTI' IASADENA, CALIFORNIA.

FORI FOR CONCRETE WALL CONSTRUCTION.

Application filed September 13, 1922. Serial No. 587,91*?.

T 0 all whom it may concern.'

Be it known that I, JAMES JOHNSON, a citizen of the United States, residing at South Pasadena, in the county of Los Angeles and State of California, have invented new and useful Improvements in Forms for Concrete Wall Construction, of which the following is a specification.

My invention relates to forms for concrete wall construction, and more particularly pertains to a collapsible core form adapted to be disposed between the ordinary side board forms in order that the wall vwhen formed will be cored out to provide ventilating spaces and will be stronger and more economical of construction.

The object of my invention is to provide a core form for the above recited purpose which will be simple, efficient, and cheap and durable of construction, and which may be etiiciently braced and held in shape while the cement mixture is being placed around the same, and quickly and easily collapsed and removed after the mixture has become suiiciently set, in order that it may again be utilized when another course of the mixture is laid.

Other objects of my invention will be more fully disclosed in the following specification, reference being had to the accompanying drawings forming a part thereof, in which:

Fig. 1 is a. plan view of a portion of a concrete wall showing my invention as it would appear during the construction of the same.

Fig. 2 is a longitudinal section through the same, taken on the line 2-2 of Fig. 1, viewed in the direction indicated by the arrows.

Fig. 3 is a transverse section through the same, taken on the line 3 3 of Fig. 1, viewed in the direction indicated bythe arrows.

Fig. 4 is a perspective View of one of the end members of the core form.

Fig. 5 is a perspective view ot a toggle brace bar member.

Fig. 6 is a ragmental view of one of the side members of the core form.

The core form 10 is built up oit' five members, including two end members 11 and 12, which are identical in construction, two side members 13 and 14, which are also identical in construction, and the brace or toggle bar member 15.

The end member 11 is preferably formed of a rectangular piece of flexible sheet metal which is bent in the shape of a bow and has its edges doubled backward to form the hooks 16. Riveted to the sheet metal and disposed at its edges are the oppositely disposed vertical strengthening angle iron ribs 17, and riveted at the crown of the bow is a vertically disposed angle iron rib 18.

Riveted'to the angle iron 18 at its upper and lower ends is an inwardly projecting V shaped brace bar 19, and disposed between said brace bar and one of the angle iron ribs 17 is a cross bar 20. A pairot toggle levers 21 are disposed between the angle irons 17, and comprise the bars 22 and 23 pivoted together at 24 and having their ends pivoted at 25 to said angle irons. The free end of bar 22 is provided with an ear 26 adapted to project over the top edge of bar 23-in order that the toggle may be conveniently manipi ulated.

The side member 13 is preferably formed of a rectangular piece of sheet metal, the oppositely disposed end edges of which are bent backwardly in parallel relation with its body portion in order to form hooks 27 thereon adapted to engage with the hooks 16 on the members 11 and 12 to form the core member.

The toggle brace bar member 15 comprises the bars 28 and 29 pivoted together' at 30 and having notches 31 formed in their ends adapted to engage with the bars 20 of the members 11 and 12 in order to form a continuous collapsible brace between their crowns, the bar 28 being provided with an ear 32 for the purpose of conveniently either locking or breaking the toggle when desired.

By the above recited construction it will be obvious that in order to assemble the core forms it will only be necessary to interlock the hooks 16 of the end members with the hooks 27 of the side members 13, as clearly shown in Fig. 1 of the drawings.

In building the wall the ordinary side boards 33 may be employed, spaced the desired distance apart, and braced in the usual manner, the side boards being` o'f the desired height to form a course. The core forms which are of a correspondingheight to the boards 33 are then placed in between the boards in a manner shown in Fig. 1. The cement mixture is then packed between the boards and around the core forms.

After the cement mixture has become sufticiently set', the toggle braces 21 and 15 are Cil broken by a Ipullfupwardly on theears 26,

and the toggle'15 is also broken'bj)7 a pull upwardly on the ear 32. rlhe breaking of the toggle member 2li will cause the. edges.

of the member 1.1 to be drawn inwardly toward each other and consequently` pull theV side member 13 inwardly and free from the cement, and the breaking of the toggle l5' will cause the members 11 and 12 to be drawn inwardly` toward each` other free fromfftfh'ez'cement, and also. will disengagev the'hookmembers 1&6 and 27, thus collapsing the. core. form.` and' separating its various members soath'atfthey may loe/readily lifted 'from thelcement' wall andbe utilized again in theI construction of another course.

By constructingthe corel n'iember in` the manner described itl willibeobvious'that its constituent'membersmay be drawn inwardly toward a com-mon` centery and, away from thecement, by: means of the toggle members, to lcollapse thesame. and rednce'the` area thereof,l and: also toseparate the side membersromthe end-members, thus permitting of the removal of." the members from thev end'members towardeach other. and disen.

gaging.v them. from the side members.

25A; core form, comprisingia pair'of oppositely; disposed,l bow members formed. 0f-

sheet metal havinghoolrs; formed'o'n'their opposededges, a pair of'oppositelly disposed sidemembers having hooks formed on their edges adaptedl to engage with the hooks on the end members, andan expanding and contractingbrace barmember disposed between said end members.

3. A core form, comprising a pair of oppositely disposed bow shaped end members formed of sheet met-ah hayingf'adjustable brace bars disposed' transversely between their edges, a pair ofoppositely disposed: l

side membersdet'achably secured'to saidbow shaped end members,` and an expanding and contracting brace barfmember disposed longitudinally and between the crowns of said bow shaped end members.

4L. A core form, coniprisingr a. pairv of op-v positely disposed metallic bow members, at

pair of: metallic side: members, the 'vert caly edges of all of said `membersy beingpro vided'with yinterlocking flanges,V whereby the` members may be detachably secured together, means connected to-sald,` bowfmembers for expanding. andI contracting saidl members transversely, and" al second expandI ingfand contracting means eonneetedfto said bow members and disposed'in Vparallel relationto said side members, whereby the assembled core. form may` be expanded and contracted along its longitudinal` axis.

In witness that Iy claim.` the foregoing I. have hereunto subscribed 'my name-this :25th

day of Julyl 1922.

JAMES JOHNSON; 

